diff options
Diffstat (limited to 'drivers/cxl/cxl.h')
| -rw-r--r-- | drivers/cxl/cxl.h | 312 |
1 files changed, 283 insertions, 29 deletions
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 6799b27c7db2..f680450f0b16 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -7,6 +7,7 @@ #include <linux/libnvdimm.h> #include <linux/bitfield.h> #include <linux/bitops.h> +#include <linux/log2.h> #include <linux/io.h> /** @@ -53,9 +54,12 @@ #define CXL_HDM_DECODER0_CTRL_LOCK BIT(8) #define CXL_HDM_DECODER0_CTRL_COMMIT BIT(9) #define CXL_HDM_DECODER0_CTRL_COMMITTED BIT(10) +#define CXL_HDM_DECODER0_CTRL_COMMIT_ERROR BIT(11) #define CXL_HDM_DECODER0_CTRL_TYPE BIT(12) #define CXL_HDM_DECODER0_TL_LOW(i) (0x20 * (i) + 0x24) #define CXL_HDM_DECODER0_TL_HIGH(i) (0x20 * (i) + 0x28) +#define CXL_HDM_DECODER0_SKIP_LOW(i) CXL_HDM_DECODER0_TL_LOW(i) +#define CXL_HDM_DECODER0_SKIP_HIGH(i) CXL_HDM_DECODER0_TL_HIGH(i) static inline int cxl_hdm_decoder_count(u32 cap_hdr) { @@ -64,6 +68,57 @@ static inline int cxl_hdm_decoder_count(u32 cap_hdr) return val ? val * 2 : 1; } +/* Encode defined in CXL 2.0 8.2.5.12.7 HDM Decoder Control Register */ +static inline int cxl_to_granularity(u16 ig, unsigned int *val) +{ + if (ig > 6) + return -EINVAL; + *val = 256 << ig; + return 0; +} + +/* Encode defined in CXL ECN "3, 6, 12 and 16-way memory Interleaving" */ +static inline int cxl_to_ways(u8 eniw, unsigned int *val) +{ + switch (eniw) { + case 0 ... 4: + *val = 1 << eniw; + break; + case 8 ... 10: + *val = 3 << (eniw - 8); + break; + default: + return -EINVAL; + } + + return 0; +} + +static inline int granularity_to_cxl(int g, u16 *ig) +{ + if (g > SZ_16K || g < 256 || !is_power_of_2(g)) + return -EINVAL; + *ig = ilog2(g) - 8; + return 0; +} + +static inline int ways_to_cxl(unsigned int ways, u8 *iw) +{ + if (ways > 16) + return -EINVAL; + if (is_power_of_2(ways)) { + *iw = ilog2(ways); + return 0; + } + if (ways % 3) + return -EINVAL; + ways /= 3; + if (!is_power_of_2(ways)) + return -EINVAL; + *iw = ilog2(ways) + 8; + return 0; +} + /* CXL 2.0 8.2.8.1 Device Capabilities Array Register */ #define CXLDEV_CAP_ARRAY_OFFSET 0x0 #define CXLDEV_CAP_ARRAY_CAP_ID 0 @@ -193,31 +248,77 @@ enum cxl_decoder_type { */ #define CXL_DECODER_MAX_INTERLEAVE 16 +#define CXL_DECODER_MIN_GRANULARITY 256 + /** - * struct cxl_decoder - CXL address range decode configuration + * struct cxl_decoder - Common CXL HDM Decoder Attributes * @dev: this decoder's device * @id: kernel device name id - * @platform_res: address space resources considered by root decoder - * @decoder_range: address space resources considered by midlevel decoder + * @hpa_range: Host physical address range mapped by this decoder * @interleave_ways: number of cxl_dports in this decode * @interleave_granularity: data stride per dport * @target_type: accelerator vs expander (type2 vs type3) selector + * @region: currently assigned region for this decoder * @flags: memory type capabilities and locking - * @target_lock: coordinate coherent reads of the target list - * @nr_targets: number of elements in @target - * @target: active ordered target list in current decoder configuration - */ + * @commit: device/decoder-type specific callback to commit settings to hw + * @reset: device/decoder-type specific callback to reset hw settings +*/ struct cxl_decoder { struct device dev; int id; - union { - struct resource platform_res; - struct range decoder_range; - }; + struct range hpa_range; int interleave_ways; int interleave_granularity; enum cxl_decoder_type target_type; + struct cxl_region *region; unsigned long flags; + int (*commit)(struct cxl_decoder *cxld); + int (*reset)(struct cxl_decoder *cxld); +}; + +/* + * CXL_DECODER_DEAD prevents endpoints from being reattached to regions + * while cxld_unregister() is running + */ +enum cxl_decoder_mode { + CXL_DECODER_NONE, + CXL_DECODER_RAM, + CXL_DECODER_PMEM, + CXL_DECODER_MIXED, + CXL_DECODER_DEAD, +}; + +/** + * struct cxl_endpoint_decoder - Endpoint / SPA to DPA decoder + * @cxld: base cxl_decoder_object + * @dpa_res: actively claimed DPA span of this decoder + * @skip: offset into @dpa_res where @cxld.hpa_range maps + * @mode: which memory type / access-mode-partition this decoder targets + * @pos: interleave position in @cxld.region + */ +struct cxl_endpoint_decoder { + struct cxl_decoder cxld; + struct resource *dpa_res; + resource_size_t skip; + enum cxl_decoder_mode mode; + int pos; +}; + +/** + * struct cxl_switch_decoder - Switch specific CXL HDM Decoder + * @cxld: base cxl_decoder object + * @target_lock: coordinate coherent reads of the target list + * @nr_targets: number of elements in @target + * @target: active ordered target list in current decoder configuration + * + * The 'switch' decoder type represents the decoder instances of cxl_port's that + * route from the root of a CXL memory decode topology to the endpoints. They + * come in two flavors, root-level decoders, statically defined by platform + * firmware, and mid-level decoders, where interleave-granularity, + * interleave-width, and the target list are mutable. + */ +struct cxl_switch_decoder { + struct cxl_decoder cxld; seqlock_t target_lock; int nr_targets; struct cxl_dport *target[]; @@ -225,6 +326,76 @@ struct cxl_decoder { /** + * struct cxl_root_decoder - Static platform CXL address decoder + * @res: host / parent resource for region allocations + * @region_id: region id for next region provisioning event + * @calc_hb: which host bridge covers the n'th position by granularity + * @cxlsd: base cxl switch decoder + */ +struct cxl_root_decoder { + struct resource *res; + atomic_t region_id; + struct cxl_dport *(*calc_hb)(struct cxl_root_decoder *cxlrd, int pos); + struct cxl_switch_decoder cxlsd; +}; + +/* + * enum cxl_config_state - State machine for region configuration + * @CXL_CONFIG_IDLE: Any sysfs attribute can be written freely + * @CXL_CONFIG_INTERLEAVE_ACTIVE: region size has been set, no more + * changes to interleave_ways or interleave_granularity + * @CXL_CONFIG_ACTIVE: All targets have been added the region is now + * active + * @CXL_CONFIG_RESET_PENDING: see commit_store() + * @CXL_CONFIG_COMMIT: Soft-config has been committed to hardware + */ +enum cxl_config_state { + CXL_CONFIG_IDLE, + CXL_CONFIG_INTERLEAVE_ACTIVE, + CXL_CONFIG_ACTIVE, + CXL_CONFIG_RESET_PENDING, + CXL_CONFIG_COMMIT, +}; + +/** + * struct cxl_region_params - region settings + * @state: allow the driver to lockdown further parameter changes + * @uuid: unique id for persistent regions + * @interleave_ways: number of endpoints in the region + * @interleave_granularity: capacity each endpoint contributes to a stripe + * @res: allocated iomem capacity for this region + * @targets: active ordered targets in current decoder configuration + * @nr_targets: number of targets + * + * State transitions are protected by the cxl_region_rwsem + */ +struct cxl_region_params { + enum cxl_config_state state; + uuid_t uuid; + int interleave_ways; + int interleave_granularity; + struct resource *res; + struct cxl_endpoint_decoder *targets[CXL_DECODER_MAX_INTERLEAVE]; + int nr_targets; +}; + +/** + * struct cxl_region - CXL region + * @dev: This region's device + * @id: This region's id. Id is globally unique across all regions + * @mode: Endpoint decoder allocation / access mode + * @type: Endpoint decoder target type + * @params: active + config params for the region + */ +struct cxl_region { + struct device dev; + int id; + enum cxl_decoder_mode mode; + enum cxl_decoder_type type; + struct cxl_region_params params; +}; + +/** * enum cxl_nvdimm_brige_state - state machine for managing bus rescans * @CXL_NVB_NEW: Set at bridge create and after cxl_pmem_wq is destroyed * @CXL_NVB_DEAD: Set at brige unregistration to preclude async probing @@ -251,7 +422,26 @@ struct cxl_nvdimm_bridge { struct cxl_nvdimm { struct device dev; struct cxl_memdev *cxlmd; - struct nvdimm *nvdimm; + struct cxl_nvdimm_bridge *bridge; + struct cxl_pmem_region *region; +}; + +struct cxl_pmem_region_mapping { + struct cxl_memdev *cxlmd; + struct cxl_nvdimm *cxl_nvd; + u64 start; + u64 size; + int position; +}; + +struct cxl_pmem_region { + struct device dev; + struct cxl_region *cxlr; + struct nd_region *nd_region; + struct cxl_nvdimm_bridge *bridge; + struct range hpa_range; + int nr_mappings; + struct cxl_pmem_region_mapping mapping[]; }; /** @@ -260,50 +450,94 @@ struct cxl_nvdimm { * decode hierarchy. * @dev: this port's device * @uport: PCI or platform device implementing the upstream port capability + * @host_bridge: Shortcut to the platform attach point for this port * @id: id for port device-name * @dports: cxl_dport instances referenced by decoders * @endpoints: cxl_ep instances, endpoints that are a descendant of this port + * @regions: cxl_region_ref instances, regions mapped by this port + * @parent_dport: dport that points to this port in the parent * @decoder_ida: allocator for decoder ids + * @hdm_end: track last allocated HDM decoder instance for allocation ordering + * @commit_end: cursor to track highest committed decoder for commit ordering * @component_reg_phys: component register capability base address (optional) * @dead: last ep has been removed, force port re-creation * @depth: How deep this port is relative to the root. depth 0 is the root. + * @cdat: Cached CDAT data + * @cdat_available: Should a CDAT attribute be available in sysfs */ struct cxl_port { struct device dev; struct device *uport; + struct device *host_bridge; int id; - struct list_head dports; - struct list_head endpoints; + struct xarray dports; + struct xarray endpoints; + struct xarray regions; + struct cxl_dport *parent_dport; struct ida decoder_ida; + int hdm_end; + int commit_end; resource_size_t component_reg_phys; bool dead; unsigned int depth; + struct cxl_cdat { + void *table; + size_t length; + } cdat; + bool cdat_available; }; +static inline struct cxl_dport * +cxl_find_dport_by_dev(struct cxl_port *port, const struct device *dport_dev) +{ + return xa_load(&port->dports, (unsigned long)dport_dev); +} + /** * struct cxl_dport - CXL downstream port * @dport: PCI bridge or firmware device representing the downstream link * @port_id: unique hardware identifier for dport in decoder target list * @component_reg_phys: downstream port component registers * @port: reference to cxl_port that contains this downstream port - * @list: node for a cxl_port's list of cxl_dport instances */ struct cxl_dport { struct device *dport; int port_id; resource_size_t component_reg_phys; struct cxl_port *port; - struct list_head list; }; /** * struct cxl_ep - track an endpoint's interest in a port * @ep: device that hosts a generic CXL endpoint (expander or accelerator) - * @list: node on port->endpoints list + * @dport: which dport routes to this endpoint on @port + * @next: cxl switch port across the link attached to @dport NULL if + * attached to an endpoint */ struct cxl_ep { struct device *ep; - struct list_head list; + struct cxl_dport *dport; + struct cxl_port *next; +}; + +/** + * struct cxl_region_ref - track a region's interest in a port + * @port: point in topology to install this reference + * @decoder: decoder assigned for @region in @port + * @region: region for this reference + * @endpoints: cxl_ep references for region members beneath @port + * @nr_targets_set: track how many targets have been programmed during setup + * @nr_eps: number of endpoints beneath @port + * @nr_targets: number of distinct targets needed to reach @nr_eps + */ +struct cxl_region_ref { + struct cxl_port *port; + struct cxl_decoder *decoder; + struct cxl_region *region; + struct xarray endpoints; + int nr_targets_set; + int nr_eps; + int nr_targets; }; /* @@ -325,29 +559,31 @@ int devm_cxl_register_pci_bus(struct device *host, struct device *uport, struct pci_bus *cxl_port_to_pci_bus(struct cxl_port *port); struct cxl_port *devm_cxl_add_port(struct device *host, struct device *uport, resource_size_t component_reg_phys, - struct cxl_port *parent_port); + struct cxl_dport *parent_dport); +int devm_cxl_add_endpoint(struct cxl_memdev *cxlmd, + struct cxl_dport *parent_dport); struct cxl_port *find_cxl_root(struct device *dev); int devm_cxl_enumerate_ports(struct cxl_memdev *cxlmd); int cxl_bus_rescan(void); -struct cxl_port *cxl_mem_find_port(struct cxl_memdev *cxlmd); +struct cxl_port *cxl_mem_find_port(struct cxl_memdev *cxlmd, + struct cxl_dport **dport); bool schedule_cxl_memdev_detach(struct cxl_memdev *cxlmd); struct cxl_dport *devm_cxl_add_dport(struct cxl_port *port, struct device *dport, int port_id, resource_size_t component_reg_phys); -struct cxl_dport *cxl_find_dport_by_dev(struct cxl_port *port, - const struct device *dev); struct cxl_decoder *to_cxl_decoder(struct device *dev); +struct cxl_root_decoder *to_cxl_root_decoder(struct device *dev); +struct cxl_endpoint_decoder *to_cxl_endpoint_decoder(struct device *dev); bool is_root_decoder(struct device *dev); bool is_endpoint_decoder(struct device *dev); -bool is_cxl_decoder(struct device *dev); -struct cxl_decoder *cxl_root_decoder_alloc(struct cxl_port *port, - unsigned int nr_targets); -struct cxl_decoder *cxl_switch_decoder_alloc(struct cxl_port *port, - unsigned int nr_targets); +struct cxl_root_decoder *cxl_root_decoder_alloc(struct cxl_port *port, + unsigned int nr_targets); +struct cxl_switch_decoder *cxl_switch_decoder_alloc(struct cxl_port *port, + unsigned int nr_targets); int cxl_decoder_add(struct cxl_decoder *cxld, int *target_map); -struct cxl_decoder *cxl_endpoint_decoder_alloc(struct cxl_port *port); +struct cxl_endpoint_decoder *cxl_endpoint_decoder_alloc(struct cxl_port *port); int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map); int cxl_decoder_autoremove(struct device *host, struct cxl_decoder *cxld); int cxl_endpoint_autoremove(struct cxl_memdev *cxlmd, struct cxl_port *endpoint); @@ -357,6 +593,8 @@ struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port); int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm); int devm_cxl_add_passthrough_decoder(struct cxl_port *port); +bool is_cxl_region(struct device *dev); + extern struct bus_type cxl_bus_type; struct cxl_driver { @@ -385,6 +623,8 @@ void cxl_driver_unregister(struct cxl_driver *cxl_drv); #define CXL_DEVICE_PORT 3 #define CXL_DEVICE_ROOT 4 #define CXL_DEVICE_MEMORY_EXPANDER 5 +#define CXL_DEVICE_REGION 6 +#define CXL_DEVICE_PMEM_REGION 7 #define MODULE_ALIAS_CXL(type) MODULE_ALIAS("cxl:t" __stringify(type) "*") #define CXL_MODALIAS_FMT "cxl:t%d" @@ -396,7 +636,21 @@ struct cxl_nvdimm *to_cxl_nvdimm(struct device *dev); bool is_cxl_nvdimm(struct device *dev); bool is_cxl_nvdimm_bridge(struct device *dev); int devm_cxl_add_nvdimm(struct device *host, struct cxl_memdev *cxlmd); -struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(struct cxl_nvdimm *cxl_nvd); +struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(struct device *dev); + +#ifdef CONFIG_CXL_REGION +bool is_cxl_pmem_region(struct device *dev); +struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev); +#else +static inline bool is_cxl_pmem_region(struct device *dev) +{ + return false; +} +static inline struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev) +{ + return NULL; +} +#endif /* * Unit test builds overrides this to __weak, find the 'strong' version |